zynqmp: pm: Support ATF PM version check

Add SMC call to query ATF PM version. This version
can be used by Linux to match with expected version.
Signed-off-by: Rajan Vaja <rajanv@xilinx.com>

plat/xilinx/zynqmp/pm_service/pm_common.h

@@ -19,6 +19,11 @@
 #define PAYLOAD_ARG_CNT		6U
 #define PAYLOAD_ARG_SIZE	4U	/* size in bytes */
 
+#define ZYNQMP_TZ_VERSION_MAJOR		1
+#define ZYNQMP_TZ_VERSION_MINOR		0
+#define ZYNQMP_TZ_VERSION		((ZYNQMP_TZ_VERSION_MAJOR << 16) | \
+					ZYNQMP_TZ_VERSION_MINOR)
+
 /**
  * pm_ipi - struct for capturing IPI-channel specific info
  * @apu_ipi_id	APU IPI agent ID

plat/xilinx/zynqmp/pm_service/pm_svc_main.c

@@ -19,6 +19,7 @@
 #include "pm_ipi.h"
 
 #define PM_GET_CALLBACK_DATA	0xa01
+#define PM_GET_TRUSTZONE_VERSION	0xa03
 
 /* 0 - UP, !0 - DOWN */
 static int32_t pm_down = !0;
@@ -355,6 +356,10 @@ uint64_t pm_smc_handler(uint32_t smc_fid, uint64_t x1, uint64_t x2, uint64_t x3,
 		SMC_RET1(handle, (uint64_t)ret | ((uint64_t)value) << 32);
 	}
 
+	case PM_GET_TRUSTZONE_VERSION:
+		SMC_RET1(handle, (uint64_t)PM_RET_SUCCESS |
+			 ((uint64_t)ZYNQMP_TZ_VERSION << 32));
+
 	default:
 		WARN("Unimplemented PM Service Call: 0x%x\n", smc_fid);
 		SMC_RET1(handle, SMC_UNK);